Azathioprine is contraindicated in pregnancy, so pregnancy planning is very important. A common side effect includes gastrointestinal upset, and this may manifest as bloating, constipation, nausea, diarrhea, and may vary throughout the course of one’s time on the medication. Additionally, a long-term study of azathioprine found that the risk of lymphatic-proliferative cancers was reported to be 3%. However, while the AAR seems to be low on azathioprine, one complication with this medication is that some are not able to stay in remission on azathioprine alone and have to also be on steroids (complications of steroids will be discussed below). These medications require frequent blood draws upfront, then generally twice yearly to monitor for liver toxicity and to ensure optimal immunosuppression (absolute lymphocyte count around 1 and total white blood cell count between 3 and 4).Īzathioprine is the medication that has been around the longest. Both medications were originally FDA approved for organ transplant rejection prophylaxis, although azathioprine now is indicated in rheumatoid arthritis, and both have been widely used in several autoimmune disorders. Mycophenolate mofetil and azathioprine are both twice daily pills which broadly suppress the immune system. Clinical diligence and early intervention are important if PML is suspected.Ĭhronic immunosuppression requires regular skin exams with a dermatologist since our immune system is our best defense against cancer cells developing, and any of these treatments can interfere with its normal functioning. The manufacturer of Imuran cautions about a risk of PML with Imuran as well, but the incidence of PML on Imuran is not documented. The known rate of incidence of PML if on Rituxan is estimated at 1 in 25,000 and the rate in CellCept is estimated at 1 in 6,000 based on data from use of these medications for immunosuppression for other purposes. It is important to know that exposure to these medications in MOG antibody disease has not led to a known case of PML. Although it can be treated, it is very devastating and sometimes fatal. In someone who is immunosuppressed, this virus can escape the kidney, cross the blood-brain barrier, and enter the brain, causing profound inflammation. PML is an infection caused by the reactivation of a virus, called the JC virus, which lives in the kidney. There is also the risk with any of these medications of the development of a rare brain infection called progressive multifocal leukoencephalopathy, or PML. Good hygiene and hand washing are important if on immunosuppressants, as is having a good urologist if at risk for UTIs. Some patients presenting with optic neuritis or transverse myelitis who also test positive for the MOG antibody may start treatment after the initial event if the attack was severe and the individual does not want to risk a relapse.Īll of these medications carry a risk of infections, particularly upper respiratory infections and urinary tract infections (UTIs). Some studies from the United Kingdom have supported the use of IVIG to prevent relapses. The primary therapies used in the US are mycophenolate mofetil (CellCept), rituximab (Rituxan), azathioprine (Imuran), and repeated IVIG infusions or subcutaneous immunoglobulin. There are no FDA-approved medications for maintenance in MOG antibody disease, so anything prescribed is done off-label. Those with MOG antibody disease should consider ongoing treatment with medications that suppress the immune system. 4,13 In contrast, two other studies showed that the retinal neuro-axonal damage found after an acute attack of optic neuritis was as severe among anti-MOG positive individuals as individuals with AQP-4 positive NMOSD. 4,13 They found that one third of patients with optic neuritis and around half of patients with spinal cord inflammation made a full recovery. 4,8Ī cohort study from 2016 found that 80% of those in the cohort had a multiphasic disease and an annualized relapse rate (AAR) of 0.9. Initially, the presence of anti-MOG was thought to be associated with fewer relapses and better outcomes than those with AQP-4 positive NMOSD, 5,8 but studies with longer follow-up times indicate higher relapse rates than previously reported. Connect With SRNA and Request Materials.
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